Invalid client error trying to authorize

Hi, I have 5 client websites up under one Google Analytics account. I have Google Analytics Dashboard for WP and Google Analytics by MonsterInsights installed on all 5 sites. I had no issues with authorization of all 5 sites under MonsterInsights and no problems with authorization on 4 of the 5 sites under Google Analytics Dashboard for WP.

One site, however, would not activate showing an “invalid client” error message. See complete error copy/paste below:

401. That’s an error.

Error: invalid_client

The OAuth client was not found.

Request Details
response_type=code
redirect_uri=urn:ietf:wg:oauth:2.0:oob
client_id=6.5556129E+10.apps.googleusercontent.com
scope=https://www.googleapis.com/auth/analytics.readonly
access_type=offline
approval_prompt=auto
That’s all we know.

I notice on the one failed site that the authorization URL is formatted totally different. It looks like this:

https://accounts.google.com/o/oauth2/auth?response_type=code&redirect_uri=urn%3Aietf%3Awg%3Aoauth%3A2.0%3Aoob&client_id=6.5556129E%2B10.apps.googleusercontent.com&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fanalytics.readonly&access_type=offline&approval_prompt=auto

One of my working authorization URLs looks like this:

https://accounts.google.com/o/oauth2/approval?hd=rodneywebb.biz&as=5d36ecff7ee551c0&pageId=none&xsrfsign=AOR49-sAAAAAWIcM4-opryjJtRzA7pBadJxQv9g215YA

Two of the five sites are secure (https). One authorized fine, the one that won’t authorize is a secure site (if this makes any differnce).

Thanks for your help.